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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cdcb2bc90ba752cf1cfd674b434a0c6a4b1f62bf8c746344e0c54fa9655f1c' 
  AND token = 'adFWTH8u+uwKu76/xh+IHHboPHBeOUG/xjaCaJapXfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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