SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2622da51afbac2c9f360d32883e9de13c8ef91064d3b774356bfe359e329df' 
  AND token = 's5XIVvpu/X8jC+b2lguWPDA5UegRZaCIviOjzEI+Z2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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