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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99dbf370449fa4a9a45a41c3ed7ef9e3deeaa29bde4046c4d3e3f9245daaf13f' 
  AND token = 'GsrUifZbl9OFBvLn+Y7ucIczaVS2mBSfY3PwD2Rd/Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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