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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e8fcb192d7705752dc2b16fb70f8a50127c64f52e5692df0e692e09ef40438' 
  AND token = 'qEd1re+ZJDtPwAeNfXiHV5fTdO09H8qnXwTmVlz2Mnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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