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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735205cd4021644ad044f3f43032c147cb9182e408a5a0371d877db33c0e40c5' 
  AND token = 'vCy5DIMRzCaqMc384URk3nuCdrnoOXt9QZOHiPgzapw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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