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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b3130bfbf977d12e3fd513f0b807d2334c2a92286543cad2c27494045dfdb5' 
  AND token = 'dUjPnx1KWJWdJRp9Xjq0I4ERitmhQBHUC4jYEj7urq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}