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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c746eb1adea1aa91acd85b635d9613d53ac0a523c46c32699791384233b76b15' 
  AND token = '7ojY2LI6u9vt5rkAjPRu+vFJV+rjcYoZe5iNOYVBDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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