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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9d602cf8d0c6a5ff0c4e50ca6c6d006aa0f096472cbc58ba6c29a4ba5421eb' 
  AND token = '04PKQsy4cy46vdzbtywjfNhM7ZwVgbks27mC816k7Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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