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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c217056d347c8e73b517847db1f1b04e6efa34bcba1ef5217acf6e521cb06b3b' 
  AND token = '+3o6qcM2E1hDqzU1CFI6ojRTUaf7oHJyuAzlHXK1cgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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