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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98c509a4b037d2579838eae0672ab0bad2a5bc8e470ddb969f1560e864d178c' 
  AND token = 'OwxSaG/79TWmzXbnLJZ4Y+Te2IBxXS57xjESHabz/0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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