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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e81d918bdc9f92424af64f27b6bdfbcf4b5aeba2956719c67f44d7adb1fa13' 
  AND token = 'bK+835D9fCddEf+ByQbARokdFMNPY7z1rCgu0Ae3ZKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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