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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9919ee88cdd546a6a791eb8d6d465259ff12799d37bd509350811bab56ad473' 
  AND token = 'kmDCD3rRTFHu0QPptma9G9Hx8VOF4WpcRBYR/AZVADg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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