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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58faba7902514bf323fae2882c36c341946df8b941169d954b2ea859dd37df1f' 
  AND token = 'KQTf6W4MclX0lKCbI3lxFPToiC6sRxqL1DXowl5mkrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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