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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43760e43767e97e97d0083b0349f874ce890b308b48cc76e9db284e08a37c31' 
  AND token = '0yrP7MkF5N7DrUsd+uIh3jYjMBpyQLesHBjdWFUdeHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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