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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9940247ca0d6b917ebb5dd550e8c203e2a4ea14924e00209c86d3cd443b3a880' 
  AND token = 'WAdshAt4AnYmi3gsCKtW8NEqzgVLv7UhhV9HAqgicTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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