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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264c3c789b29720f2c3a61d1f1818d32d12df9bf3039c36ccae47771d9265e48' 
  AND token = 't4Zty9toToZHmjQnXhbG6zbkRB6u2v/cLU2DPAKaV9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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