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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93589fb38d66b8bb7e8f992f16ff282ff6f3a73b7348e252d5ff903b3e5b31d' 
  AND token = 'hjQ4UIHUD+7KL30QkhSdQGHeO87jX9QmcL2feQB8xTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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