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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887328dce1b87a58370acf1d9880f806bf5c493854074b2929e089987c4a3c81' 
  AND token = 'J4YlmXTvQpOcb3QcELpresbp9ewet6tUIg5G6oFWCsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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