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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd0cd71d154130dd5ee8c58a3c3e2c1c9db546466746293127e39e2e7db06fd' 
  AND token = 'Z8t45eNmV7UvZbu/xNpruGpFqiavyjdNMaBIHFYRWK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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