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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93044fa5890a9324fd9811b05cfcf7ef65e65fe434b4474b8589c5a086d385bd' 
  AND token = 'fUx3+ue60eBWlAd9rn6xz6UPQg52fGvuFOj9pRSRoio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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