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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66e7b619b1d749bcc8809a94d2c35c911dfe71b6c54c609772b21d927330622' 
  AND token = '9z4qRR9Sl4r788Sn0I++x/Ee+12aEG7X6g+xWIGD0AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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