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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d529e1ec55df0e5943601c20cf80385f33feda4611b2912605f32dced8cbcc' 
  AND token = 'zqInDlJcDxlbGwIa7iIfFsM4/d0mYkAYIpOlzeU9sLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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