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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3482de4c077a5539ca38a4a8c1ea4ad313ea02c3a331e2719dbea528ce78f32' 
  AND token = 'kcoFs0Ut/mIvoCEtuj3AreiRUPVtDmGV+xeSa2OzfxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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