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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8257fd699cfe268f11ff5ce1692f43328ee305dc1065e89bd13345e327969f71' 
  AND token = 'kuts6p//HCCW3Dyf76IsLYBTXHYEJgrxPByoWievlD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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