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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16adf93133409058e645d80dad66b9d7fc23d9705d4470f21662a764a2ef3b45' 
  AND token = 'd7ZiXBW5ybHxqZ83ktILUuRIxAfAc/Pm9EipEa0Rtj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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