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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50fe4afada6d7b2e4262d2653dc3a00b124235c51e575572da1b519c7709491' 
  AND token = 'Te31ieXcw8C/kpBp2RD17zt46w7/8/NpJ/Q/j8ACB+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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