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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18605f7f6053e1a8e35145f6f7f25eba1bdedafa6e2dcf8afb9fce82ff926a1b' 
  AND token = '/Xq8AkLvsoEGH4PVO+XPU5zDwfrR2tsg5mygrvhpOAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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