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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931128605f4c015c1dcbdcf5959178bdd5a669285ed73595e919f87f84f0000b' 
  AND token = 'Arg7mt6g8xgCbTmpYAgMb1mMhQ5v0UjVoB7dXtGg9dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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