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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e04d8540c26e4b4f53ecb59de1bb6abff14cc0c381eefd3b4b34156c37aac8' 
  AND token = 'TdXWaxJJawiRyELFulH1/LRr2dEP90p8LuiKB/JRGow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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