SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4580967b859731c4f68af939d761d54eb878be1cb7b0fbc7550f21180d6995f8' 
  AND token = 'MuP6Of4ZAPZ8eG6/wJ+3kegzcQGWhArp+ql+/2R2068=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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