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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ce39e6e109210ebe6e79a88cf09c0e5a0377bbf2dc0228637a62d1903a7e31' 
  AND token = '/Oxqllo3/Q+/6DyChXhCgOObQzC8PlaU9MTqHBy/rAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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