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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae90567506b81e2948e31654c1423e8225cca41ae5342f0665090cec1332cf21' 
  AND token = '9o/YUD97wCEkFp7Ek1dv0jfKSFB+SVKybElYlCC1zjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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