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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db58393fc3a96c04d1ced8b9e16bb049222554634ffcf823957b9c41f94d238' 
  AND token = 'NK+3Dm0c7UbMAJKrpjzPUbLz70pzNb/5MMf/8fbSXJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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