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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7b903ab8c875b318eb3335bbd07259cbf3b877d35fc6733b56d4e86f00b89e' 
  AND token = 'Qi+QS4ZNHEzIfwjNVyZQEL6VHn56dSlJavqhKcWlW3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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