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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9498feed3f864d469d5b5669f0e71bd2ade1a835cea44406fbc7f6edbe9f6c3c' 
  AND token = '16vECVDpKV1V4r7dTHijaMJLrrm9E5LbAQL7xat8JOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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