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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8061cd6ae556c480f912e902dc47d7417c8037e9d29d370793fbb0460635316a' 
  AND token = 'cfV1jxQmaMCV2WwABILtZdud9I/BqduSN7aKY1yCPXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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