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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cf17d0d4b9bdfa592078efc07703aee3ce0e1b09d5366eb7d816152704cce6' 
  AND token = 'p8F+xSc1eBA0i6buih0Szam8DYGTDoGA9IInZ4LfsNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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