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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d88f1043cd01e0c030c597fe7bdbb8ce29abdd47106d3bbcfd0c5df1031903b' 
  AND token = '818WuXRslspcXgDUba2FkWRc4CLD+hhI6EYZBdEO8lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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