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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c5ac8f1203a65ac9bcda1335c3447a1fbff234235d46698411f1812327dddf' 
  AND token = 'TsNDWFHzxWZKSf5ETgv4+oM0y8Ml0Zo4D9dk0YBjM9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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