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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9977903a5eeca225af9ccf84354f3b573eef40b5b83f1f8768ab78125f93cb52' 
  AND token = '3puGizOjqkYB8tKAuVdnAnh9E5npH5SVunuDyrBImEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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