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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3973c73b460de4e6aede9ee0c87988baa23f4eb2fbcd2a4c15bf5295ba934a38' 
  AND token = 'LOGGpRH9tMqOu/r4O1NYcBHSUetsD69mnLZo6kwkl8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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