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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf0ff830453ccac8c1ffce9863ed8ef203728dff9ba520f5e7987d95ca3f7ce' 
  AND token = 'cSOoiVZ7S/f33kfuT0K/T3+hDZDBbfdb5QjPe0Y2xo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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