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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a9c39a570f829f88e7f8cd1b3b0f4c59de6e0998803a6ed966ca93795f9921' 
  AND token = 'xa7H+itgKOliyi1Gd5Emoc1fcO2IZnjfNk2x9aGtWp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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