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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa065c12754714c97c88d349c9c0952ebaa04ad781093c4f5d2893a3ebafcf1' 
  AND token = 'H3x2rEYrS1qRSNV8EXWaOd2iTkpT6FLzN9MT2WB2k2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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