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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7871e78f27b8c7b3eb9f6b1f48fce4e599bfce94684bd668be0f3fdb6bcc1d' 
  AND token = 'KhkfQ1Fw/E61CfcUXpv7eDSbv16B7SHn0Zr64KsWrQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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