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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ae3dedd324350b81451f39c2ca8db0f51b17ea6f6ef221b9ce7b5e72504ea3' 
  AND token = 'wuFWDsD8H6nHyM4Na+NyJH9QBQ/i2LW40TvWvpb5dT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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